package tjut.opp.test5;

import java.util.Scanner;

public class GradeTest {
public static void main(String[] args) {
	Scanner input=new Scanner(System.in);
	System.out.println("请输入成绩：");
	int g=input.nextInt();
	if(g>=90){
		System.out.println("A");
	}else if(g>=60&&g<=89){
		System.out.println("B");
	}else {
		System.out.println("C");
	}
}
}
